U.S. patent application number 15/919340 was filed with the patent office on 2019-02-28 for method for manufacturing color filter substrate.
The applicant listed for this patent is BOE TECHNOLOGY GROUP CO., LTD., Chongqing BOE Optoelectronics Technology Co., Ltd.. Invention is credited to Ruilin BI, Min LI, Chao LIU, Jiaqi PANG, Hongyu SUN, Bin WAN, Xiongzhou WEI, Qiang XIONG.
Application Number | 20190064648 15/919340 |
Document ID | / |
Family ID | 60604008 |
Filed Date | 2019-02-28 |
United States Patent
Application |
20190064648 |
Kind Code |
A1 |
WEI; Xiongzhou ; et
al. |
February 28, 2019 |
METHOD FOR MANUFACTURING COLOR FILTER SUBSTRATE
Abstract
Provided is a method for manufacturing a color filter substrate
including a base substrate, a black matrix layer and a plurality of
color pixel units, and the color pixel unit including sub-pixel
units of at least three colors. The method for manufacturing a
color filter substrate includes: providing a base substrate; and
forming a black matrix layer and the plurality of color pixel units
on the base substrate, wherein the forming of the plurality of
color pixel units includes: depositing an irreversible
temperature-change material on the base substrate; and heating the
irreversible temperature-change material to form sub-pixel units of
at least two colors in the color pixel unit.
Inventors: |
WEI; Xiongzhou; (Beijing,
CN) ; LI; Min; (Beijing, CN) ; XIONG;
Qiang; (Beijing, CN) ; PANG; Jiaqi; (Beijing,
CN) ; LIU; Chao; (Beijing, CN) ; WAN; Bin;
(Beijing, CN) ; SUN; Hongyu; (Beijing, CN)
; BI; Ruilin; (Beijing, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
BOE TECHNOLOGY GROUP CO., LTD.
Chongqing BOE Optoelectronics Technology Co., Ltd. |
Beijing
Chongqing |
|
CN
CN |
|
|
Family ID: |
60604008 |
Appl. No.: |
15/919340 |
Filed: |
March 13, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G03F 7/105 20130101;
G03C 7/12 20130101; G02F 1/133516 20130101; G02B 5/223 20130101;
G03C 8/30 20130101; G02B 5/201 20130101; G03F 7/0007 20130101 |
International
Class: |
G03C 7/12 20060101
G03C007/12; G03F 7/00 20060101 G03F007/00; G03C 8/30 20060101
G03C008/30 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 28, 2017 |
CN |
201710751189.1 |
Claims
1. A method for manufacturing a color filter substrate comprising a
base substrate, a black matrix layer, and a plurality of color
pixel units, and the color pixel unit comprising sub-pixel units of
at least three colors, wherein the method for manufacturing the
color filter substrate comprises: providing a base substrate; and
forming a black matrix layer and the plurality of color pixel units
on the base substrate, wherein the step of forming of the plurality
of color pixel units comprises: depositing an irreversible
temperature-change material on the base substrate; and heating the
irreversible temperature-change material to form sub-pixel units of
at least two colors in the color pixel unit.
2. The method for manufacturing a color filter substrate according
to claim 1, wherein the irreversible temperature-change material
comprises material selected from a group consisting of sulfate,
nitrate, phosphate, sulfide, oxide made of lead, nickel, cobalt,
iron, cadmium, strontium, zinc, manganese, molybdenum, and
magnesium etc., and azo pigment, phthalocyanine pigment, aryl
methane dye.
3. The method for manufacturing a color filter substrate according
to claim 1, wherein the color pixel unit comprises a red sub-pixel
unit, a green sub-pixel unit, a blue sub-pixel unit and a yellow
sub-pixel unit, and the method for manufacturing the color filter
substrate comprises: forming at least two yellow sub-pixel units
with irreversible temperature-change material in each of the color
pixel units, and heating one of the yellow sub-pixel units to
obtain a green sub-pixel unit.
4. The method for manufacturing a color filter substrate according
to claim 2, wherein the color pixel unit comprises a red sub-pixel
unit, a green sub-pixel unit, a blue sub-pixel unit and a yellow
sub-pixel unit, and the method for manufacturing the color filter
substrate include: forming at least two yellow sub-pixel units with
irreversible temperature-change material in each of the color pixel
units, and heating one of the yellow sub-pixel units to obtain a
green sub-pixel unit.
5. The method for manufacturing a color filter substrate according
to claim 3, wherein the irreversible temperature-change material
comprises PbCrO.sub.4, and a temperature for heating the
irreversible temperature-change material PbCrO.sub.4 is 800.degree.
C. or higher.
6. The method for manufacturing a color filter substrate according
to claim 4, wherein the irreversible temperature-change material
comprises PbCrO.sub.4, and a temperature for heating the
irreversible temperature-change material PbCrO.sub.4 is 800.degree.
C. or higher.
7. The method for manufacturing a color filter substrate according
to claim 5, wherein a temperature for heating the irreversible
temperature-change material PbCrO.sub.4 is 800.degree. C. or
higher.
8. The method for manufacturing a color filter substrate according
to claim 6, wherein a temperature for heating the irreversible
temperature-change material PbCrO.sub.4 is 800.degree. C. or
higher.
9. The method for manufacturing a color filter substrate according
to claim 3, wherein the yellow sub-pixels are of an island
structure.
10. The method for manufacturing a color filter substrate according
to claim 4, wherein the yellow sub-pixels are of an island
structure.
11. The method for manufacturing a color filter substrate according
to claim 3, wherein the yellow sub-pixels are of a strip
structure.
12. The method for manufacturing a color filter substrate according
to claim 4, wherein the yellow sub-pixels are of a strip
structure.
13. The method for manufacturing a color filter substrate according
to claim 1, wherein the sub-pixel units requiring heating are
heated by a fixed point and independently controlled heating
method.
14. The method for manufacturing a color filter substrate according
to claim 11, wherein sub-pixel units in one strip are heated
simultaneously.
15. The method for manufacturing a color filter substrate according
to claim 12, wherein sub-pixel units in one strip are heated
simultaneously.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of China Patent
Application No. 201710751189.1 and titled "MANUFACTURING METHOD FOR
COLOR FILTER SUBSTRATE" filed with the China Patent Office on Aug.
28, 2017, the entire content of which is hereby incorporated by
reference.
TECHNICAL FIELD
[0002] The present disclosure relates to the field of display
technology, and in particular, to a method for manufacturing a
color filter substrate.
BACKGROUND
[0003] A Color filter substrate, as an important part of a display
device, has to be manufactured through a complicated process.
During the manufacture of a color filter substrate, the main
process is focused on the manufacture of pixels. For a pixel
composed of traditional three RGB primary colors, to form each of
the colors, the pixel has to go through a separate mask process
including cleaning, coating, exposing, developing and so on. Thus,
the pixel composed of three primary colors requires three masking
processes. Currently, RGBY four-color pixel display devices have
also been widely developed. A RGBY four-color pixel is based on the
pixel composed of traditional RGB three primary colors, with an
additional yellow sub-pixel to form a RGBY four-color pixel.
Through the four-color technology, a wider color gamut can be
realized without consuming more power.
[0004] However, it also means that an additional mask is required
to form the yellow pixel, which increases the complexity of the
process. Regardless of the traditional RGB three-primary color
pixel structure or the emerging RGBY four-color pixel structure,
the use of mask needs to be minimized. A series of processes such
as cleaning, coating, exposing and developing can be eliminated for
each mask that is eliminated, which can significantly reduce the
complexity of the process.
[0005] It should be noted that the information disclosed in the
above background section is only for the enhancement of
understanding of the background of the present disclosure and
therefore can include other information that does not form the
prior art that is already known to one of ordinary skill in the
art.
SUMMARY
[0006] The present disclosure provides a for manufacturing a color
filter substrate comprising a base substrate, a black matrix layer,
and a plurality of color pixel units, and the color pixel unit
comprising sub-pixel units of at least three colors, wherein the
method for manufacturing the color filter substrate comprises:
[0007] providing a base substrate; and
[0008] forming a black matrix layer and the plurality of color
pixel units on the base substrate, wherein the forming of the
plurality of color pixel units comprises:
[0009] depositing an irreversible temperature-change material on
the base substrate; and
[0010] heating the irreversible temperature-change material to form
sub-pixel units of at least two colors in the color pixel unit.
[0011] In an exemplary embodiment, the irreversible
temperature-change material comprises material selected from a
group consisting of sulfate, nitrate, phosphate, sulfide, oxide
made of lead, nickel, cobalt, iron, cadmium, strontium, zinc,
manganese, molybdenum, and magnesium etc., and azo pigment,
phthalocyanine pigment, aryl methane dye.
[0012] In an exemplary embodiment, the color pixel unit comprises a
red sub-pixel unit, a green sub-pixel unit, a blue sub-pixel unit
and a yellow sub-pixel unit, and the method for manufacturing the
color filter substrate comprises:
[0013] forming at least two yellow sub-pixel units with
irreversible temperature-change material in each of the color pixel
units, and heating one of the yellow sub-pixel units to obtain a
green sub-pixel unit.
[0014] In an exemplary embodiment, the irreversible
temperature-change material comprises PbCrO.sub.4, and a
temperature for heating the irreversible temperature-change
material PbCrO.sub.4 is 800.degree. C. or higher.
[0015] In an exemplary embodiment, a temperature for heating the
irreversible temperature-change material PbCrO.sub.4 is 800.degree.
C. or higher.
[0016] In an exemplary embodiment, the yellow sub-pixels are of an
island structure.
[0017] In an exemplary embodiment, the yellow sub-pixels are of a
strip structure.
[0018] In an exemplary embodiment, the sub-pixel units requiring
heating are heated by a fixed point and independently controlled
heating method.
[0019] In an exemplary embodiment, sub-pixel units in one strip are
heated simultaneously.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] FIG. 1 is a schematic structural diagram of a color filter
substrate with RGB three-color pixels.
[0021] FIG. 2 is a schematic structural diagram of a color filter
substrate with RGBY four-color pixels.
[0022] FIG. 3 is a layout diagram of a yellow sub-pixel unit
template of an island structure in the related art.
[0023] FIG. 4 is a layout diagram of a yellow sub-pixel unit
template of a strip structure in the related art.
[0024] FIG. 5 is a flowchart of a method for manufacturing a color
filter substrate according to the present disclosure.
[0025] FIG. 6 is a flowchart of a method for manufacturing a color
filter substrate according to an embodiment of the present
disclosure.
[0026] FIG. 7 is a layout diagram of a yellow sub-pixel unit
template of an island structure according to an embodiment of the
present disclosure.
[0027] FIG. 8 is a schematic diagram of a pixel arrangement after
exposure and development using the layout shown in FIG. 7.
[0028] FIG. 9 is a schematic structural diagram of a heating device
for heating the yellow sub-pixel unit.
[0029] FIG. 10 is a schematic diagram of a pixel arrangement after
the pixels in FIG. 8 are heated.
[0030] FIG. 11 is a layout diagram of a yellow sub-pixel unit
template of a stripe structure according to another embodiment of
the present disclosure.
[0031] FIG. 12 is a schematic diagram of a pixel arrangement after
exposure and development using the layout in FIG. 11.
[0032] FIG. 13 is a schematic diagram of a pixel arrangement after
the pixels in FIG. 12 are heated.
DETAILED DESCRIPTION
[0033] The disclosure is further described below in detail with
reference to the accompanying drawings and embodiments. It should
be understood that the specific embodiments described herein are
only used for explaining the present disclosure rather than
limiting the present disclosure. In addition, it should also be
noted that, for the convenience of description, only some but not
all structures related to the present disclosure are shown in the
accompanying drawings.
[0034] FIG. 1 is a schematic structural diagram of a color filter
substrate with RGB three-color pixels. As shown in FIG. 1, a color
filter substrate including RGB tree-color pixels includes a
plurality of color pixel units arranged on a black matrix layer.
Each color pixel unit includes a red sub-pixel unit 1, a green
sub-pixel unit 2 and a blue sub-pixel unit 3. In the related art,
in the process of forming these sub-pixel units, the following
method is usually adopted.
[0035] First, an ITO (indium tin oxide) anode layer and a black
matrix layer are formed on a substrate, and the ITO anode layer and
the black matrix layer are formed by a conventional process, which
is not described herein again. After the ITO anode layer and the
black matrix layer are completed, photoresist is coated on the
black matrix layer with a mask, to form the red sub-pixel unit 1 by
exposure and development, where a mask process is required. After
the red sub-pixel unit is formed, through the same process,
photoresist is coated on the black matrix layer with a mask, to
form the green sub-pixel unit 2 by exposure and development, where
a mask process is also required. After that, through the same
process, photoresist is coated on the black matrix layer with a
mask, to form the blue sub-pixel unit 3 by exposure and
development, where a mask process is also required. The formation
of the RGB color filter substrate requires three mask
processes.
[0036] FIG. 2 is a schematic structural diagram of a color filter
substrate with RGBY four-color pixels. As shown in FIG. 2, a color
filter substrate including RGBY four-color pixels includes a
plurality of color pixel units arranged on a black matrix layer,
and each of the color pixel units includes a red sub-pixel unit
101, a green sub-pixel unit 102, a green sub-pixel unit 103 and a
yellow sub-pixel unit 104. In the related art, in the process of
forming these sub-pixel units, the following method is usually
adopted.
[0037] First, an ITO (indium tin oxide) anode layer and a black
matrix layer are formed on a substrate, and the ITO anode layer and
the black matrix layer are formed by a conventional process, which
is not described herein again. After the ITO anode layer and the
black matrix layer are completed, photoresist is coated on the
black matrix layer with a mask, to form the red sub-pixel unit 101
by exposure and development, where a mask process is required.
After the red sub-pixel unit is formed, through the same process,
photoresist is coated on the black matrix layer with a mask, to
form the green sub-pixel unit 102 by exposure and development,
where a mask process is also required. After that, through the same
process, photoresist is coated on the black matrix layer with a
mask, to form the green sub-pixel unit 103 by exposure and
development, where a mask process is also required. Finally,
through the same process, photoresist is coated on the black matrix
layer with a mask, to form the yellow sub-pixel unit 104 by
exposure and development, where a mask process is also
required.
[0038] Since in the color filter substrate with RGBY four-color
pixels, each color pixel unit includes four sub-pixel units of four
colors: red, yellow, blue and green, four mask processes are
required. The formation order of the sub-pixel units described
above is only exemplary, and their formation order may be
arbitrarily set.
[0039] FIG. 3 is a layout diagram of a yellow sub-pixel unit
template of an island structure in the related art. FIG. 4 is a
layout diagram of a yellow sub-pixel unit template of a strip
structure in the related art. Regardless of whether the yellow
sub-pixel unit is an island-like structure or a stripe structure,
four mask layers are required for forming the color filter
substrate with four-color RGBY pixels, and the complexity of the
process is high.
[0040] In order to reduce the number of masks used in manufacturing
the color filter substrate, the present disclosure provides the
following technical solutions.
[0041] As shown in FIG. 5, at least one embodiment of the present
disclosure provides a method for manufacturing a color filter
substrate. The color filter substrate includes a base substrate, a
black matrix layer and a plurality of color pixel units. The color
pixel unit includes sub-pixel units with at least three types of
colors. The method for manufacturing a color filter substrate
includes the following steps.
[0042] In step S501, a base substrate is provided.
[0043] A black matrix layer and the plurality of color pixel units
are formed on the base substrate. The step of forming the plurality
of color pixel units includes the following steps.
[0044] In step S502, an irreversible temperature-change material is
deposited on the base substrate.
[0045] In step S503, the irreversible temperature-change material
is heated to form sub-pixel units of at least two colors in the
color pixel unit.
[0046] The irreversible temperature-change pigment is selected from
a group consisting of sulfate, nitrate, phosphate, sulfide, oxide
made of lead, nickel, cobalt, iron, cadmium, strontium, zinc,
manganese, molybdenum, and magnesium etc., and azo pigment,
phthalocyanine pigment, aryl methane dye. These pigments or dyes
are discolored by their own thermal decomposition, oxidation or
chemical combination. Since they are chemical changes, the process
is irreversible, and some of the physical changes are also
irreversible.
[0047] In the method for manufacturing a color filter substrate
provided by the present disclosure, an irreversible
temperature-change material is adopted to form sub-pixel units of a
part of colors in a color pixel unit, and the part of colors are
heated to obtain sub-pixel units of other colors. It can reduce the
number of times of using a mask, and can reduce the complexity of
the process.
[0048] Specifically, the present embodiment provides a method for
manufacturing a color filter substrate. The color filter substrate
includes a base substrate, a black matrix layer and a plurality of
color pixel units. The color pixel unit includes sub-pixel units
with four colors, respectively, a red sub-pixel unit, a green
sub-pixel unit, a yellow sub-pixel unit and a blue sub-pixel
unit.
[0049] FIG. 6 is a flowchart of a method for manufacturing a color
filter substrate according to an embodiment of the present
disclosure. The method includes the following steps.
[0050] In step S601, a base substrate is first provided. In step
S602, an ITO anode layer and the black matrix layer are
manufactured on the base substrate according to a conventional
process. Next, in step S603, the black matrix layer is exposed and
developed through a conventional process to manufacture the blue
sub-pixel unit and the red sub-pixel unit.
[0051] Next, the yellow sub-pixel unit template is designed. FIG. 7
is a layout diagram of a yellow sub-pixel unit template of an
island structure according to an embodiment of the present
disclosure. In this embodiment, the blue sub-pixel unit, the red
sub-pixel unit and the yellow sub-pixel unit are designed in an
island shape, which increases design flexibility.
[0052] As shown in FIG. 7, a yellow sub-pixel unit 404 is designed
on a black matrix. Then in step S604, yellow sub-pixel units are
formed with an irreversible temperature-change material.
[0053] FIG. 8 is a schematic diagram of a pixel arrangement after
exposure and development using the layout shown in FIG. 7. As shown
in FIG. 8, a yellow sub-pixel unit 404 is formed between the red
sub-pixel unit 401 and the blue sub-pixel unit 403. The circled
portion as shown by the dotted line in FIG. 8 may be regarded as
one color pixel unit 410, and in each color pixel unit 410, the
arrangement order of one red sub-pixel unit 401, one blue sub-pixel
unit 403, and two yellow sub-pixel units 404 may be arbitrary.
[0054] Then, in step S605, one of the yellow sub-pixel units in
each of the color pixel units is heated. Since the yellow sub-pixel
unit is formed of an irreversibly temperature-change material
pigment, it turns into a green sub-pixel unit after being
heated.
[0055] Irreversible temperature-change pigment refers to that when
the pigment is heated to a certain temperature, the color of the
pigment changes permanently, and the color generated no longer
disappears. For example, the irreversible temperature-change
pigment is selected from a group consisting of sulfate, nitrate,
phosphate, sulfide, oxide made of lead, nickel, cobalt, iron,
cadmium, strontium, zinc, manganese, molybdenum, and magnesium
etc., and azo pigment, phthalocyanine pigment, aryl methane dye.
These pigments or dyes are discolored by their own thermal
decomposition, oxidation or chemical combination. Since they are
chemical changes, the process is irreversible, and some of the
physical changes are also irreversible.
[0056] For example, the irreversible temperature-change pigment
PbCrO.sub.4 can change from yellow to green at 800.degree. C., and
the green color no longer disappears.
[0057] In the present embodiment, PbCrO.sub.4 is selected to
manufacture the yellow sub-pixel unit, and then one of the yellow
sub-pixel units in each of the colored pixel units is heated to
become a green sub-pixel unit.
[0058] FIG. 10 is a schematic diagram of a pixel arrangement after
the pixels in FIG. 8 are heated. As shown in FIG. 10, a red
sub-pixel unit 401, a green sub-pixel unit 402, a blue sub-pixel
unit 403 and a yellow sub-pixel unit 404 are included in each of
the color pixel units 410 to obtain RGBY sub-pixel units of four
colors. The arrangement of the sub-pixel units in FIG. 10 is only
an example, and the arrangement of the sub-pixel units of the four
colors may be arbitrary.
[0059] In this embodiment, one mask is used to form two yellow
sub-pixel units in one color pixel unit, one of the yellow
sub-pixel units is heated to become a green sub-pixel unit, and it
is no longer necessary to form a green sub-pixel unit through a
mask process. The green sub-pixel unit is formed by heating and
changing the yellow sub-pixel unit, without the need of forming the
green sub-pixel unit through a mask process as in the related art.
It can eliminate one mask process, and realize the manufacture of
the RGBY pixel structure through three mask processes, rather than
the four mask process required in the related art to manufacture
the RGBY pixel structure. It can reduce the complexity of the
process, and reduce material and equipment costs.
[0060] In this embodiment, a fixed point and independently
controlled heating method can be used to heat a selected point.
FIG. 9 is a schematic structural diagram of a heating device for
heating the yellow sub-pixel unit. The above mentioned heating of
the yellow sub-pixel unit is performed by the fixed-point heating
method. Heating the region of the yellow sub-pixel unit 404
(corresponding to the position of the green sub-pixel unit 402 in
FIG. 10) specifically includes heating the selected yellow
sub-pixel unit by using a heating layer 411 (as shown in FIG. 9).
In an exemplary manner, the selected yellow sub-pixel unit may be
covered with the heating layer 411, and the heating layer 411 is
energized to generate heat, to heat the selected yellow sub-pixel
unit. The portion of the heating layer 411 corresponding to the
region other than the region of the yellow sub-pixel unit 404
(corresponding to the position of the green sub-pixel unit 402 in
FIG. 9) is a thermal insulation region. The thermal insulation
region may be a notch, a hollowed region or a thermal insulation
layer, such that the portion not heated by the heating layer 411
remains the original color and the portion heated by the heating
layer 411 turns green.
[0061] The specific yellow sub-pixel units in each row of pixels
may be heated with such heating device to change into green
sub-pixel units. This can increase the flexibility of the design,
and the sub-pixel units need to be heated can be selected as
desired.
[0062] Another embodiment of the present disclosure provides a
method for manufacturing a color filter substrate, which includes
the following steps.
[0063] First a base substrate is provided. Then, an ITO electrode
layer and a black matrix layer are manufactured on the base
substrate according to a conventional process in the related art.
Next, conventionally, photoresist is applied on the black matrix
layer, and exposed and developed to manufacture the blue sub-pixel
unit and red sub-pixel unit.
[0064] Next, the yellow sub-pixel unit template is designed. FIG.
11 is a layout diagram of a yellow sub-pixel unit template of a
stripe structure according to another embodiment of the present
disclosure. As shown in FIG. 11, two yellow sub-pixel units 704
spaced apart from each other are designed on the black matrix. In
step S804, the yellow sub-pixel units are then formed with an
irreversible temperature-change material.
[0065] FIG. 12 is a schematic diagram of a pixel arrangement after
exposure and development using the layout in FIG. 11. As shown in
FIG. 12, a yellow sub-pixel unit 704 is formed between one red
sub-pixel unit 701 and one blue sub-pixel unit 703, and a circled
portion by the dotted line in FIG. 11 may be regarded as one color
pixel unit 710. Each of the color pixel units 710 includes one red
sub-pixel unit 701, one blue sub-pixel unit 703, and two yellow
sub-pixel units 704. The two yellow sub-pixel units 704 are not
adjacent to each other and spaced apart by the blue sub-pixel unit
703 or the red sub-pixel unit 701. The arrangement order of the
sub-pixel units of the colors in FIG. 12 is merely an example. The
arrangement of the red sub-pixel unit 701, the blue sub-pixel unit
703 and the two yellow sub-pixel units 704 in each color pixel unit
may be arbitrary.
[0066] Then, in step S805, one of the yellow sub-pixel units in
each of the color pixel units is heated. Since the yellow sub-pixel
unit is formed of the irreversible temperature-change pigment, it
changes to a green sub-pixel unit after being heated.
[0067] As shown in FIG. 12, in this embodiment, the sub-pixel units
of the same color are arranged in a stripe arrangement, that is,
the arrangement of sub-pixel units in each sub-pixel unit is the
same, so that the colors of the sub-pixel units in each column are
the same. For example, the arrangement of the yellow sub-pixel
units is a stripe structure, and all of the sub-pixel units in a
certain column are yellow sub-pixel units.
[0068] The heating device used is a strip-shaped heating device.
When a yellow sub-pixel unit is heated, the yellow sub-pixel units
in the same strip may be heated simultaneously, to be changed to
green sub-pixel units. That is, yellow sub-pixel units of a
plurality of color pixel units can be heated simultaneously to be
changed to green sub-pixel units, which can improve the heating
efficiency.
[0069] In this embodiment, PbCrO.sub.4 is selected for
manufacturing the yellow sub-pixel units, and yellow sub-pixel
units in each strip are heated to change them into green sub-pixel
units.
[0070] FIG. 13 is a schematic diagram of a pixel arrangement after
the pixels in FIG. 12 are heated. As shown in FIG. 12, a red
sub-pixel unit 701, a green sub-pixel unit 702, a blue sub-pixel
unit 703 and a yellow sub-pixel unit 704 are included in each of
the color pixel units 710 to obtain RGBY sub-pixel units of four
colors. The arrangement of the sub-pixel units in FIG. 13 is only
an example, and the arrangement of the sub-pixel units of the four
colors may be arbitrary.
[0071] In this embodiment, one mask is used to form two yellow
sub-pixel units in one color pixel unit, one of the yellow
sub-pixel units is heated to become a green sub-pixel unit, and it
is no longer necessary to form a green sub-pixel unit through a
mask process. The green sub-pixel unit is formed by heating and
changing the yellow sub-pixel unit, without the need of forming the
green sub-pixel unit through a mask process as in the related art.
It can eliminate one mask process, and realize the manufacture of
the RGBY pixel structure through three mask processes, rather than
the four mask process required in the related art to manufacture
the RGBY pixel structure. It can reduce the complexity of the
process, and reduce material and equipment costs.
[0072] In addition, in this embodiment, a strip-shaped heating
device is used, which can heat one sub-pixel units in one strip and
can improve the heating efficiency.
[0073] The manufacturing method of the above embodiments is only an
example, the color change between the sub-pixel units is not
limited to the above change from yellow to green, and other color
change may also be performed.
[0074] It should be noted that the color filter substrate in this
embodiment may include sub-pixels of three colors, for example,
red, green and blue sub-pixel units, and the green sub-pixel unit
may be formed of an irreversible temperature-changing material.
Alternatively, the color filter substrate may also include
sub-pixels of four colors or more, such as red, blue, green, yellow
sub-pixel units, or red, blue, green, white sub-pixel units, and
the like, which are not particularly limited herein.
[0075] It should be understood by those skilled in the art that the
present disclosure is not limited to the specific embodiments
described herein, and various obvious changes, modifications and
substitutions can be made by those skilled in the art without
departing from the scope of the present disclosure. Therefore,
although the present disclosure has been described in detail
through the above embodiments, the present disclosure is not
limited to the above embodiments, and more other equivalent
embodiments may also be included without departing from the concept
of the present disclosure, the scope of which is defined by the
appended claims.
* * * * *